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Investments (Tables) | 12 Months Ended
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Dec. 31, 2012
Investments, Classified as Level One Securities | Investments, which have been classified as ASC 805 Level 1 securities, at December 31 consisted of the following:
|  | 2012 Carrying Value |  |  | 2011 Carrying Value |
(in thousands) |  | Current |  |  | Non- Current |  |  | Current |  |  | Non- Current |
Available-for-sale equity securities |  | $ | — |  |  | $ | — |  |  | $ | 36 |  |  | $ | — |
Certificates of deposit and other securities |  |  | 8,183 |  |  |  | 16 |  |  |  | 7,591 |  |  |  | 516 |
Total investments |  | $ | 8,183 |  |  | $ | 16 |  |  | $ | 7,627 |  |  | $ | 516 |
Summary of Available-for-Sale Securities | The following table summarizes available-for-sale securities at December 31:
(in thousands) |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2012 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
2011 |  | $ | 25 |  |  | $ | 11 |  |  | $ | — |  |  | $ | 36 |
Summary of Proceeds and Realized Gains/(Losses) on Equity Securities and Certificates of Deposit | The following table summarizes the proceeds and realized gains/(losses) on equity securities and certificates of deposit for the years ended December 31:
(in thousands) |  | Proceeds |  |  | Gross Realized Gains |  |  | Gross Realized Losses |
2012 |  | $ | 10,654 |  |  | $ | 13 |  |  | $ | — |
2011 |  | $ | 12,950 |  |  | $ | 124 |  |  | $ | — |
2010 |  | $ | 9,327 |  |  | $ | 6 |  |  | $ | — |

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 + Details
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